You know what, I'm looking at your live blog now. I think that's far more akin to what I've been looking at known for.

Trying to get posting to work from Known->10C

Lets try the simple posts option

PHP CURL is awful

oh, you have my sympathies. I was there myself with WP.

If there's anything I can do to help, please, genuinely, do not hesitate to ask.

Graaaak!!! The other way round!!!
Logged into KNOWN, then logged into quill.

</facepalm>

I'm sorry, jeremy, I thought I replied to this hours ago. It worked for me as follows:
Logged into Quill
Logged into Known
Refreshed the list of Syndic Endpoints in Quill
Then the endpoints appeared, and were remembered in future by Quill

What are you trying to do with known that's causing you so much trouble?

I have used Quill to post to Known.